Method of forming metallic gaskets in manhole-frames.



H. JONES.

METHOD OF FORMING METALLIC GASKETS IN MANHOLE FRAMES.

} APPLICATION FILED MAR. 9, 1911.

995,015, Patented June 13,1911.

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HARRY JONES, OF SUFFERN, NEW YORK, ASSIGNOR T0 EDWARD H. FALLOWS, OF NEW YORK, N. Y.

METHOD OF FORMING- METALLIC GASKETS IN MANHOLE-FRAMES.

To all whom it may concern:

Be it known that I, HARRY J ONES, a citizen of the United States, and a resident of Suffern, in the county of Rockland and State of New York, have made and invented certain new and useful Improvements in Methods of Forming Metallic Gaskets in Manhole-Frames, of which the following is a specification.

My invention relates to a process or method of forming a metallic gasket in manhole frames and upon which gasket the cover of the manhole rests when placed in position to close the opening in the frame; and the object thereof is to devise a method whereby a number of manhole frames may.

be provided, each with a metallic gasket, and all of which gaskets will be of the same form, so that manhole covers having definite features of construction will be interchangeable with, and capable of use with any particular manhole frame, this result being accomplished at a minimum of effort and expense, all as hereinafter explained, to which end my invention consists in the process hereinafter disclosed and claimed.

In the accompanying drawing, wherein I have illustrated a device wherewith the process or method in which my invention consists may be performed; Figure 1 is a view showing in plan a master frame used in performing my process; Fig. 2 is a view showing a section upon a plane indicated by the line 2, 2, Fig. 1, a fragment of the manhole frame being included in this view; Fig. 3 is a view of the master frame upon a plane indicated by the line 3, 3, Fig. 1; Fig. 4 is a view showing a fragment of a slightly modified form of manhole frame; and Fig. 5 is a sectional view showing a manhole frame provided with a metallic gasket in accordance with my method, with a manhole cover in place therein.

In the drawing, 6 designates a manhole frame, and 7 is a ledge extending about the opening in the manhole frame and which ledge serves as a support for the manhole cover 8, the periphery of which commonly rests directly upon the said ledge. The ledge 7 is provided with a groove 9 extending throughout its length, and which groove is preferably widest at its bottom in order that the metallic gasket may be retained in place.

The reference character 10 designates a 5 master frame of a form corresponding with Specification of Letters Patent. Patgnted June 13, 1911;

Application filed March 9, 1911. Serial No. 613,216.

the opening in the manhole frame, and which master frame has a groove upon the under side of its outer portion, as shown at 11, which groove overlies the groove 9 when the master frame is"in place within the opening in the manhole frame; the master frame being, it will be understood, of approximately the same dimensions as the opening in the manhole frame so as to fit thereinto. hen the master frame is in place an inclosed space will be formed between the ledge 7 and master frame 10, as will be understood from Fig. 2, which space will extend about the opening in the manhole frame. The master frame 10 is provided with one or more gates 12 and with a corresponding number of passages 13 leading into the groove 11, the said gates being removable so that the master frame may be removed without injuring the gasket after the same has been formed as hereinafter disclosed.

The master frame having been placed in position, and the gates 12 secured in place, an easily fusible molten metal, such as, for example, zinc, is poured through one or more of the gates 12 and into the registering grooves 11 and 9 whereby the gasket 14 shown in Figs. 4 and 5 is produced, the lower portion of which gasket occupies the groove 9, while the upper portion extends above the surface of the ledge 7. It is advisable to pour the molten metal through all the gates 12 simultaneously, as chilling of the metal is thereby avoided and the danger that the metal will not properly fill the grooves 9 and 11 is avoided.

The manhole frame is provided with passages 15 through which such Water as may pass through the joint between the manhole cover and frame will escape to the outer side of the frame instead of flooding the gasket 14 and passing into the interior of the frame should the joint not be absolutely tight, these openings preferably communicating with a groove 16, Fig. 4, formed in the ledge 7 outside the gasket 14.

The outer portion of the under side of the covers 8 will be faced for a short distance inward from the periphery of the cover so as to provide a finished plain surface to rest upon the gasket 14, and the gaskets formed in any number of frames by my method being all alike or identical with one another, it will be understood that the covers are interchangeable, and that a particular manhole frame provided with a. gasket formed in accordance wtih my method may be provided with a cover selected at random; and

that the necessity of providing each frame with a gasket appropriate for and which will form a tight joint only with one particular cover, and then only when the cover occupies a definite position relative to the manhole frame, is avoided.

Having thus explained my invention and described a device wherewith the same may be practicecLI claim and desire to secure by Letters Patent:

The method of forming a metallic gasket a man-hole frame having a groove extending about the opening therein which consists in applying to said frame a master frame having a groove which overlies that in the ing an easily fusible metal into the space formed by said two registerlng grooves; and finally removing said master frame from said manhole frame, whereby a projecting metallic gasket is formed, the lower portion of which lies within the groove in the manhole frame.

Signed at Sufi'ern, inthe county of Rockland and State of New York, this 27th day of February, A. D. 1911.

HARRY JONES.

Witnesses: V

EUGENE M. GREEN, 0. C. MORGAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

